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你以为两个方块速度不同？按鼠标左键试试

import pgzrun as game
WIDTH = 800
HEIGHT = 400
blackshow = True
x = 0

def draw():
    screen.fill("white")
    if blackshow:
        for y in range(0, 800,40):
            box = Rect((y, 0),(20, HEIGHT))
            screen.draw.filled_rect(box,"black")
    b1 = Rect((x, 100), (80,40))
    screen.draw.filled_rect(b1, "light yellow")
    b2 = Rect((x, 300), (80, 40))
    screen.draw.filled_rect(b2, "blue")

def update():
    global x
    x += 1
    if x >= WIDTH:
        x = 0

def on_mouse_down():
    global blackshow
    blackshow = not blackshow

game.go()